Play behavior in the year-old infant
Subtitle: early sex differences
By: Susan Goldberg and Michael Lewis
Contributors: Lewis, Michael, 1937 January 10-
Series: Research Bulletin -- 44; Research bulletin (Educational Testing Service) -- RB-68-44
Publisher: Educational Testing Service
Published: 1968
Place of publication: Princeton, New Jersey
Language: eng
Number of pages: 22
Subjects: Sex differences; Developmental psychology; Educational tests and measurements
Notes: "October 1968."

Includes bibliographical references (p. 16-17).